the.com/boysenberry

a Franken-berry built from blackberry, raspberry, and loganberry that nearly vanished into legend

means A large, dark reddish-purple berry that's a hybrid cross of blackberry, raspberry, and loganberry, prized for its rich, slightly tart flavor.

from Named after Rudolph Boysen, the horticulturist who first crossbred the plant in the early 20th century in California. His experiment nearly died out, but the vines were rescued and popularized by farmer Walter Knott (of Knott's Berry Farm fame), who named the fruit in Boysen's honor — turning a forgotten hybrid into a household name. So it's a true eponym: a man's surname plus 'berry.'

origin
Named for grower Rudolph Boysen, who almost lost it
rescue mission
Walter Knott revived the dying vines in 1932
theme park fuel
Built Knott's Berry Farm into an empire
triple hybrid
Crossbred from three different berry plants
giant berries
Larger and juicier than common blackberries
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